Transparent, flexible and highly conductive ion gels from ionic liquid compatible cyclic carbonate network
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1 Transparent, flexible and highly conductive ion gels from ionic liquid compatible cyclic carbonate network Satyasankar Jana,* Anbanandam Parthiban, Christina L. L. Chai* Institute of Chemical and Engineering Sciences (ICES), Agency for Science, Technology and Research (A*STAR), 1, Pesek Road, Jurong Island, Singapore SUPPORTING INFORMATION Content Page no. i) Materials 2 ii) Instrumentation 2 iii) Synthesis of cyclic carbonate methacrylate (CCMA) monomer 3 iv) Synthesis of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide ([EMIM][TFSI[) 4 v) Synthesis of poly(cyclic carbonate methacrylate) (PCCMA) in [EMIM][TFSI] 5 vi) Details of CCMA based triblock copolymer structure 5 vii) Typical preparation of ion gel (IG) based on CCMA network in [EMIM][TFSI] by route A 6 viii) Typical preparation of ion gel (IG) based on CCMA network in [EMIM][TFSI] by route B (including photograph) 7 ix) Thermogravimetric analysis results of ion gels produced by route A and B 8 x) Measurement of ionic conductivity of ion gels by impedance spectroscopy 9 xi) References 1 1
2 i) Materials Methacrylic acid (MAA, 99 %), 4-dimethylaminopyridine (DMAP, 99 %), 1-methylimidazole, redistilled (> 99 %) ethylene glycol dimethacrylate (EGDMA), hexamethylenediamine (HMDA, 98 %), and poly(ethylene glycol) dimethacrylate 55 (PEGDMA 55) samples were supplied by Aldrich. CuBr (98 %) was obtained from Acros. Glycerol 1,2-carbonate (GC, >93 %) was supplied by TCI. N,N -dicyclohexylcarbodiimide (DCC, 99+ %), 1-butyl-4-methylpyridinium tetrafluoroborate ([BMP][BF 4 ], >97%) and 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF 4 ], 98%) were purchased from Fluka. Bis(trifluoromethane)sulfonimide lithium salt (LiTFSI, 98 %), diethylenetriamine (DETA, 99 %), 1-n-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ], 98 %), benzoyl peroxide (97 %) and p-xylylenediamine (XDA, 97 %) were bought from Alfa Aesar. Bromoethane (> 99 %) was bought from Merck. DMF and DCM (HPLC grade) were purified by passing through a solvent purification system (Glass Contour) and used without any further purification. ii) Instrumentation 1 H NMR and 13 C NMR spectra were recorded on 4 MHz and 1 MHz Bruker UltraShield AVANCE 4SB spectrometer respectively. Residual solvent peaks were used as internal standard. A Digilab Excalibur Series FTS3 infra-red spectrometer was used to collect Fourier Transform Infra-red (FT-IR) spectra. Elemental microanalysis was performed using Eurovector E3 elemental analyzer. High resolution mass spectra were recorded on Agilent 621 TOF/LCMS. Thermogravimetric analysis (TGA) was carried out under N 2 atmosphere at a heating rate of 1 o C/ min using SDT-296T TA Instruments. The DMF run Size Exclusion Chromatography (SEC) system was equipped with a Viscotek GPCmax Pump module, a Viscotek TDA 32 refractive index detector unit, fitted with TOSOH H HR Guard Column and one TOSOH GMH HR -M mixed bed column (5 m, ID 7.8 mm 3 mm). The eluent flow rate was 1. ml/min, and the columns were maintained at 6 C. Impedance spectroscopy of polymer electrolytes was recorded in an Autolab PGSTAT 32 electrochemical test system (Eco Chemie, Netherland). AC signal of 1mv amplitude was applied over the frequency range of Hz to 1Hz at 23 C. 2
3 iii) Synthesis of cyclic carbonate methacrylate (CCMA) monomer O O OH + O HO O GC MAA DCC/DMAP O O O O O CCMA Scheme S1 Synthesis of CCMA monomer. DCC ( g, mmol), glycerol carbonate (GC, 7. g, mmol) and 4- dimethylaminopyridine (DMAP, 72 mg,.593 mmol) were dissolved in dry DCM (75 ml) and the solution was cooled in an ice bath for 3 min. DCM solution (25 ml) of methacrylic acid (MAA, 5.13 g, mmol) was added dropwise to the previous solution over a period of 3 min and the stirring was continued for another 3 min on ice bath. The mixture was then brought to room temperature and stirred for further 2½ h. The white precipitated dicyclohexylurea byproduct was filtered off and the clear product solution was concentrated to 75 ml. The reaction mixture solution was washed with water (3 75 ml), dried over MgSO 4 and then concentrated to 2 ml in a rotary evaporator to produce a white colored viscous liquid. This was cooled in a freezer for 4 h and then passed through a cotton plug to remove more urea byproduct (because of the highly polar nature of CCMA monomer, the urea byproduct was found to be soluble in the liquid monomer). The product was finally purified by column chromatography using 9:1 ether/ hexane mixture to produce colourless viscous liquid (yield 7.58 g, 67 %). Found C, 51.41; H, 5.62 %; calculated for C 8 H 1 O 5 ; C, 51.61; H, 5.41 %. Mass m/z found [M+Na] + = ; Calculated for C 8 H 1 O δ H (4 MHz; CDCl 3 ): 1.95 (3H, s, CH 3 ), 4.33 (2H, m, CH 2 ), 4.44 (1H, m, CH 2 ), 4.58 (1H, t, CH 2 ), 4.98 (1H, m, CH), 5.66 (1H, s, methacrylate CH 2 ), 6.15 (1H, s, methacrylate CH 2 ). δ C (1 MHz; CDCl 3 ): 18.16, 63.44, 66.7, 73.8, , , ,
4 iv) Synthesis of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide ([EMIM][TFSI]) F 3 C O S N O S CF 3 O Li O LiTFSI Scheme S2 Synthesis of [EMIM][TFSI]. The ionic liquid [EMIM][TFSI] was synthesized in two steps by a slightly modified procedure reported by Watanabe et al. 1 Step I (synthesis of EMIMBr): Bromoethane (19.91 g, mol) was added dropwise to a mixture of 1-methylimidazole (1 g,.1218 mol) in cyclohexane (5 ml) and stirred at room temperature for 1 h and refluxed at 8 o C for another 23 h. The mixture was cooled to room temperature and two separate layers were obtained. The upper cyclohexane layer was decanted off and the lower layer was concentrated in a rotary evaporator to yield a white solid. The solid was then dissolved in acetonitrile (25 ml) and precipitated from ethyl acetate (15 ml). The solvent was decanted off and the white crystalline product was dried in a vacuum oven at 4 o C overnight. Yield 22.7 g (97.5%). The product was very hygroscopic and was characterized by 1 H and 13 C NMR spectroscopy. δ H (4 MHz; CDCl 3 ): (3H, t, CH 3 ), (3H, s, NCH 3 ), (2H, q, NCH 2 CH 3 ), and 7.87 (each 1H, s, CH), (1H, s, CH). δ C (1 MHz; CDCl 3 ): 15.13, 35.69, 44.6, , 123.5, Step II (synthesis of [EMIM][TFSI]): Aqueous solution (4 ml) EMIMBr (11.64 g, 6.89 mmol) was added slowly to the aqueous solution (5 ml) of LiTFSI (17.48 g, 6.89 mmol) at room temperature and stirred for 2 h. Initially the mixture was cloudy and after a few minutes then a clear ionic liquid layer separated out at the bottom. The top aqueous phase was decanted off and the organic layer was washed with water (4 5 ml). The colorless IL was concentrated in a high vacuum rotary evaporator (1.5 h at 65 o C) followed by drying in a vacuum oven at 1 o C for 24 h and another 12 o C for another 24 h. The final product was stored in dry box/ glove box. Yield 21.2 g (88 %). δ H (4 MHz; CDCl 3 ): (3H, t, CH 3 ), (3H, s, NCH 3 ), 4
5 4.23 (2H, q, NCH 2 CH 3 ), and (each 1H, s, CH), 9.14 (1H, s, CH). δ C (1 MHz; CDCl 3 ): 15.5, 35.65, 44.8, , , ESI-MS Found [M] + = ; calculated for EMIM and [M] ; calculated for TFSI v) Synthesis of poly (cyclic carbonate methacrylate) (PCCMA) in [EMIM][TFSI] Cyclic carbonate methacrylate (CCMA,.25 g, mmol) and benzoyl peroxide (BPO, 6.5 mg,.65 mmol, 2 mol % relative to CCMA) were dissolved in [EMIM][TFSI] (1 g) at room temperature and then purged with N 2 for 3 min. The mixture was then heated at 8 o C for 16h under N 2 to produce a highly viscous homogeneous transparent solution. The mixture was then diluted by DMF (~ 4 ml) and the polymer was precipitated from excess DCM (~1 ml). The product was repeatedly washed with acetone and then dried in vacuum oven at 8 o C for 24 h to produce fine white powder (.245 g, 98 %). The polymer was soluble in DMF, DMSO, [BMIM][PF 6 ], [EMIM][BF 4 ], [EMIM][TFSI], [BMP][BF 4 ] and insoluble in other common organic solvents. The polymer was characterized by 1 HNMR spectroscopy, SEC (DMF) and TGA. Mn (GPC in DMF) 12498, PDI vi) Details of CCMA based triblock copolymer structure PCCMA-b-PEG-b-PCCMA triblock copolymers were synthesised by ATRP using dibromo PEG macroinitiators. The experimental details and all characterizations are discussed elsewhere. 2 Copolymer P1: (CCMA) 43 -(EG) 7 -(CCMA) 43 ; M n 1635 (calculated); observed Mn 179 (NMR), 2221(GPC in DMF), PDI Copolymer P2: (CCMA) 47 -(EG) 13 -(CCMA) 47 ; M n 1847 (calculated); M n 298 (NMR), 2246 (GPC in DMF), PDI
6 vii) Typical preparation of ion gel (IG) based on CCMA network in [EMIM][TFSI] by route A. Scheme S3 Preparation of ion gels by route A. Ion gel, IG6: CCMA (6 mg,.3223 mmol), PEGDMA 55 (8.9 mg,.1612 mmol, 5 mol% relative to CCMA), initiator BPO (1.72 mg,.79 mmol, 2 mol% of total vinyl content) and ionic liquid [EMIM][TFSI] (294 mg,.752 mmol) were mixed and stirred for an hour at room temperature under N 2 to ensure a homogenous solution. The mixture was then injected (.7 ml) by syringe to a glass or teflon mould with circular cut Teflon spacer (12 mm diameter and ~.5 mm thick) and then heated at 8 o C for 24 h in an oven under N 2 atmosphere. The sample was cooled to room temperature and a clear self standing disc shaped gel sample was peeled off from the mould. It was observed that clarity of the ion gel produced in glass mould (with Teflon spacer) is better than that produced using a teflon mould (with Teflon spacer). Usually ion gels produced using teflon mould were used for impedance measurement. Thickness of the ion gel film was measured after impedance measurement using micrometer. Ion gel, IG1: This sample was prepared by the procedure similar to IG6 but with the addition of LiTFSI (23.1 mg,.857 mmol; 25 mol % relative to CCMA) before polymerisation. 6
7 viii) Typical preparation of ion gel (IG) based on CCMA network in [EMIM][TFSI] route B Scheme S4 Preparation of ion gels by route B. At first a stock solution of p-xylylenediamine (XDA, 5 mg) in 1 mg of [EMIM][TFSI] was prepared by mixing at ~ 5 o C. Then copolymer P1 ((CCMA) 43 -(EG) 7 -(CCMA) 43 ; 6 mg,.3223 mmol w.r.t. CCMA unit) was dissolved in.1 ml DMF and mixed with [EMIM][TFSI] (125 mg). DMF was removed in high vacuum oven at 7-8 o C for > 4h (checked by weight difference) to produce transparent and viscous solution. Then the stock solution of p- xylylenediamine (13 mg, XDA content 4.3 mg,.3223 mmol; ~ 1 % w.r.t. CCMA unit content in polymer) was carefully added to the polymer solution and mixed well. The viscous mixture was then transferred to the teflon mould as described before. The sample was then cured at 7 o C for 24 h (It was observed that while curing this mixture at RT, gel was formed but did not produce a self-standing film). A transparent flexible disc was collected from the mould after cooling to room temperature. Usual polymer content of these gels was ~ %. Thickness of the film was measured after impedance measurement using micrometer. Ion gels using hexamethylenediamine (HMDA) or diethylenetriamine (DETA) were prepared in same manner but cured at room temperature. 7
8 Fig. S1 Photograph of ion gel sample IG14 prepared by route B. ix) Thermogravimetric analysis results of ion gels produced by route A and B Fig. S2 TGA overlay of different ion gels (IG4 and IG5 were synthesized by route A and IG11 and IG12 were synthesized by route B). 8
9 ix) Measurement of ionic conductivity of ion gels by impedance spectroscopy Ion gel discs were placed in between two mirror finished steel electrodes (12 mm diameter) covered with Teflon casing to measure ionic conductivity. The impedance spectra of all samples were recorded at 23 o C and the resistance for each sample was obtained by extrapolating the linear plot (for highly conductive and low polymer content samples) or by fitting circle to the kinetic control part of the plot (for low conductive and high polymer content samples, for IG1, IG3 and IG7). In general, impedance spectra followed the Nyquist plot for Warburg impedance (for highly conductive and low polymer content samples) or the Nyquist diagram for mixed circuit (for lower conductive and high polymer content samples). The actual resistance of each sample was the real part of the resistance (Z ) where the imaginary part of resistance (Z ) is assumed to be zero Fig. S3 Impedance spectrum of IG6. 9
10 Fig. S4 Impedance spectrum of IG Fig. S5 Impedance spectrum of IG14. xi) References 1) M. A. B. H. Susan, T. Kaneko, A. Noda and M. Watanabe, J. Am. Chem, Soc., 25, 127, ) S. Jana, H. Yu, A. Parthiban and C. L. L. Chai, manuscript submitted to J. Polym. Sci.: Part A: Polym. Chem. 1
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